Inner tube for pneumatic tires



March 4 1924.

J. F. STRANAHAN ET AL INNER TUBE FOR PNEUMATIC TIRES Original FiledApril 10 Patented Mar. 4, 1924.

UNITED STATES I 4 1,486,055 PATENT OFFICE.

JAMES F. STRANAHAN, F

INNER TUEBE FOR PNEUMATIC TIRES.

Application To all whom it may concern:

Be it known that we, JAMES F. STRANA- ,rmu and Joan F. Mona, citizens ofthe United States, residing at Milwaukee, in

6 the county of Milwaukee and State of Wisconsin, and

meda and State of California, respectively,

have inventedfcertain new and useful Improvements in Inner Tubes forPneumatic 10 Tires; and we do hereby declare the following to be' afull, clear, and exact descri tion of the invention, such as will enab 0others skilled in the art to which it apperthe direction in which thetire carrying the tube is rotating.

Another object of this invention is the provision of an inner tube ofthe above stated character which will be simple, durable and eflicient,and which may be manufactured and sold at a comparatively low 'cost. 7

With these and other objects in view as will become more apparent as thedescrip- 3 tion proceeds, the invention consists in certain novelfeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described and claimed. a 4 I For a completeunderstanding of our invention, reference is to be had to the followingdescription and accompanying drawing in which:

igure 1 is .a longitudinal sectional view, illustrating an inner tubeconstructed in accordance with our invention,

Figure 2 is a transverse sectional view taken on the line 22 of Figure1.

Referring in detail to the drawing, the

numeral 1 indicates an inner tube which during its construction isformed in the usual manner by hav' the ends thereof positioned onewithin e other as shown at 2 and subjected to a vulcanizing process theusual filling Oakland, in the county of Ala-.

filed April 10, 1922, Serial No. 551,078. mama, 1:, 1923.

for the purpose of causing the ends to adhere and establish a leak-proofconnection. The tube 1, at a point diametrically opposite to thevulcanized end, is provided with or inflating valve 3. The innermost endof the tube 1 has formed therein a wall or partition 4 having a smallopening 5 to permit a very slow circulatignt e of air in the tube duringthe use :of device in a tire and during the rotation of I the latter.The wall 4 acts as a retarder or valve to the air and by retarding thecirculation of the airin the tube, the latter is revented from beingruptured by the air oming expanded due to heat caused by' friction ofthe air against the walls of the tube and in a direction opposite to thedirection in which the tube is rotating. We

MILWAUKEE, WISCONSIN, AND JOHN F. HOBA, .01 OAK- LAND, CALIFORNIA.

have by experiment determined that the air within an inner tubeof apneumatic tire circulates in a direction opposite to the direction ofrotation of the tube, consequently causing friction between the tube andair and causing the latter to become highly heated and to expand to ahigh degree, causing an over due amount of pressure in the tube whichcauses the tube to burst, or

more commonly known as a blowout. With our invention located in thetube, the circulation of the air is retarded to such an ex- --ten t thatfriction is reduced to a minimum,

consequently keeping the tube in a cool condition. With the tube keptcool, the tire or shoe in which the tube is located remains cool duringthe rotation thereof owing'to the currents of air striking the same.

The partition 4 has secured thereto a collar or layer of material 6 forthe purpose ofreinforcing and: strengthening the latter about theopening .5.

While we have shown and described the preferred embodiment of ourinvention, it will be understood that minor changes in construction,combination and arrangement of parts may be made without departing fromthe spirit and scope of the invention as claimed- Having thus describedour invention, what we claim is:

1. A device (I); Ithe characteit'lsselt 52;: com risin a tu avi its enis one the other ani l vulcanized, a wall formed on the innermost end ofthe tube and provided with an opening, and a rein Q] essons forcingcollar carried by said wall and surperforation, said Wall serving toretard the rounding the 0 e circulating action of air in the tube.

2. A device 0 the c aracter specified com- In testimony whereof We aflixour signaprisin an ingatable tdubde, saig tube gaging tures in presenceof two Witnesses.

5 one 0 its en 3 provi e Wit a wa av- H ing a perforation therein, theother end of M% the tube being open and adapted to telesco icallyreceive the first end of the tube Witnesses: an be vulcanized thereto,and a reinforc- R. M. DORTON,

10 ing ring on said wall and. surrounding said Geo. T. @LIVER.

